In the 1930's, the United Fruit Company was excavating the fertile, yet remote, farmlands of Costa Rica, near the Diquis Valley on the Pacific Ocean coast. United Fruit is the major importer of bananas and they became interested in this region of Costa Rica because of a blight that had killed many banana trees on the Caribbean coast. As workers dug and prepared the land for cultivation, they discovered many large stone spheres buried and impaled in the tropical soil.
Since then, archaeologists have been perplexed by the stones. Thousands have now been found. Some are as small as four inches -- about the size of a baseball -- while others are a massive eight feet in diameter. Estimates of their age goes back some 1,600 years, yet no one can be sure how they were made, by whom, or why.
"All of this has lead some researchers to speculate that the stone spheres were made by aliens, a lost civilization and even the people of Atlantis." Another quote from....